Clinical trial registration.
Watts
R
R
Cubie
S
S
D002986:Clinical Trials as Topic / Q000379:methods / Q000592:standards*; D016208:Databases, Factual / Q000592:standards; D006801:Humans; D007391:International Cooperation; D012042:Registries; D012107:Research Design; D012219:Rheumatology / Q000592:standards; D014944:World Health Organization